Depending on the year there are a few ways to open trunks when battery is dead. The earlier cars ('97-'99) had a hidden wire to pull. It was under the wheel arch liner on the passenger side (US cars). On later models there is a pull out terminal in the fuse panel. It has a picture of an open front trunk lid. Connect the positive terminal form a donor battery to the terminal in the fuse box. Connect the negative terminal of the donor battery to the door latch striker. Unlock the trunk with the switch. The alarm system will probably sound. Recharge battery.
There are other methods; search on the internet.
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